Greg - 5/24/2013 12:49 PM
Good answers, that makes perfect sense now. As pressure increases (as it does when you fill a scuba tank), the temperature increases. As pressure decreases (as it does when you empty a scuba tank), temperature decreases.
I suppose that’s also why scuba tanks may show 3000 psi directly after a fill, but drop to around 2800 psi when the tank and air cools.